And chances are, once their penis does stop growing, many guys will probably start wondering why they weren’t born like Ron Jeremy, right?

It’s true: Most guys are clueless and many are convinced their penises are smaller than normal. A study in 2005 illustrated this perfectly. The researchers evaluated 92 guys who had come in to their hospital clinic complaining of a “small-sized penis.” Here’s what the researchers found: Out of the 92 men, no one was abnormally short. They were all just overestimating average size. After getting some facts and figures, most of them were relieved. A lot of men may claim that they’ve never tried to measure their own penis, but I’m not sure you should believe them all. There are no good data here. But I’ve had enough conversations with guys to know that it’s pretty common, especially in the early years of adolescence.

Read more of Dr. Fisch’s advice in his book:Size Matters; The Hard Facts About Male Sexuality That Every Woman Should Know…And All The Knowledge You Need To Improve Your Sex Life